12168954538 has 32 divisors (see below), whose sum is σ = 20668833360. Its totient is φ = 5333852160.

The previous prime is 12168954439. The next prime is 12168954541. The reversal of 12168954538 is 83545986121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 40998409 + 12127956129 = 6403^2 + 110127^2 .

It is a super-3 number, since 3×12168954538³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86295 + ... + 178282.

Almost surely, 2^12168954538 is an apocalyptic number.

12168954538 is a deficient number, since it is larger than the sum of its proper divisors (8499878822).

12168954538 is a wasteful number, since it uses less digits than its factorization.

12168954538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264682.

The product of its digits is 2073600, while the sum is 52.

The spelling of 12168954538 in words is "twelve billion, one hundred sixty-eight million, nine hundred fifty-four thousand, five hundred thirty-eight".